org.jboss.tools.common.validation.JBTValidationException
	at org.jboss.tools.common.validation.ValidatorManager.validateInJob(ValidatorManager.java:101)
	at org.eclipse.wst.validation.internal.operations.ValidatorJob.run(ValidatorJob.java:78)
	at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)
Caused by: java.util.ConcurrentModificationException
	at java.util.HashMap$HashIterator.nextEntry(HashMap.java:793)
	at java.util.HashMap$ValueIterator.next(HashMap.java:822)
	at org.jboss.tools.common.validation.internal.ProjectValidationContext.clearAll(ProjectValidationContext.java:212)
	at org.jboss.tools.common.validation.ValidationContext.clearAllResourceLinks(ValidationContext.java:247)
	at org.jboss.tools.common.validation.ValidatorManager.validateInJob(ValidatorManager.java:83)
	... 2 more